JUnit两个变量迭代各自的值集,创建测试函数

Question

检查函数有两个参数,我想为各个域的笛卡尔积的每个元素都有一个测试用例,但是没有手动编写所有的测试用例.

void check(Integer a, Integer b) { ... }

@Test
public void test_1_2() { check(1, 2); }

...

在python我会去

class Tests(unittest.TestCase):
    def check(self, i, j):
        self.assertNotEquals(0, i-j)



for i in xrange(1, 4):
    for j in xrange(2, 6):
        def ch(i, j):
            return lambda self: self.check(i, j)
        setattr(Tests, "test_%r_%r" % (i, j), ch(i, j))

我怎么能用Java和JUnit做到这一点？

Answer 1

有了理论,你可以写下:

@RunWith(Theories.class)
public class MyTheoryOnUniverseTest {

    @DataPoint public static int a1 = 1;
    @DataPoint public static int a2 = 2;
    @DataPoint public static int a3 = 3;
    @DataPoint public static int a4 = 4;

    @DataPoint public static int b2 = 2;
    @DataPoint public static int b3 = 3;
    @DataPoint public static int b4 = 4;
    @DataPoint public static int b5 = 5;
    @DataPoint public static int b6 = 6;

    @Theory
    public void checkWith(int a, int b) {
        System.out.format("%d, %d\n", a, b);
    }
}

(使用JUnit 4.5测试)

编辑

理论也会产生很好的错误信息:

Testcase: checkWith(MyTheoryOnUniverseTest):        Caused an ERROR
checkWith(a1, b2) // <--- test failed, like your test_1_2

因此,您无需为测试命名,以便轻松识别故障.

EDIT2

或者你可以使用DataPoint 的注释:

@DataPoints public static int as[] = { 1, 2, 3, 4} ;
@DataPoints public static int bs[] = { 2, 3, 4, 5, 6};

@Theory
public void checkWith(int a, int b) {
    System.out.format("%d, %d\n", a, b);
}